svg.js

js基本操作

		if(rawNode){
			shape = dojo.lang.shallowCopy(this.shape, true);
			for(var i in shape) {
				shape[i] = rawNode.getAttribute(i);
			}
		}
		return shape;	// dojo.gfx.Shape
	},

	attach: function(rawNode){
		// summary: reconstructs all shape parameters from a Node.
		// rawNode: Node: an SVG node
		if(rawNode) {
			this.rawNode = rawNode;
			this.fillStyle = this.attachFill(rawNode);
			this.strokeStyle = this.attachStroke(rawNode);
			this.matrix = this.attachTransform(rawNode);
			this.shape = this.attachShape(rawNode);
		}
	}
});

dojo.declare("dojo.gfx.Group", dojo.gfx.Shape, {
	// summary: a group shape (SVG), which can be used 
	//	to logically group shapes (e.g, to propagate matricies)

	setRawNode: function(rawNode){
		// summary: sets a raw SVG node to be used by this shape
		// rawNode: Node: an SVG node
		this.rawNode = rawNode;
	}
});
dojo.gfx.Group.nodeType = "g";

dojo.declare("dojo.gfx.Rect", dojo.gfx.shape.Rect, {
	// summary: a rectangle shape (SVG)

	attachShape: function(rawNode){
		// summary: builds a rectangle shape from a Node.
		// rawNode: Node: an SVG node
		var shape = null;
		if(rawNode){
			shape = dojo.gfx.Rect.superclass.attachShape.apply(this, arguments);
			shape.r = Math.min(rawNode.getAttribute("rx"), rawNode.getAttribute("ry"));
		}
		return shape;	// dojo.gfx.shape.Rect
	},
	setShape: function(newShape){
		// summary: sets a rectangle shape object (SVG)
		// newShape: Object: a rectangle shape object
		this.shape = dojo.gfx.makeParameters(this.shape, newShape);
		this.bbox = null;
		for(var i in this.shape){
			if(i != "type" && i != "r"){ this.rawNode.setAttribute(i, this.shape[i]); }
		}
		this.rawNode.setAttribute("rx", this.shape.r);
		this.rawNode.setAttribute("ry", this.shape.r);
		return this;	// self
	}
});
dojo.gfx.Rect.nodeType = "rect";

dojo.gfx.Ellipse = dojo.gfx.shape.Ellipse;
dojo.gfx.Ellipse.nodeType = "ellipse";

dojo.gfx.Circle = dojo.gfx.shape.Circle;
dojo.gfx.Circle.nodeType = "circle";

dojo.gfx.Line = dojo.gfx.shape.Line;
dojo.gfx.Line.nodeType = "line";

dojo.declare("dojo.gfx.Polyline", dojo.gfx.shape.Polyline, {
	// summary: a polyline/polygon shape (SVG)
	
	setShape: function(points){
		// summary: sets a polyline/polygon shape object (SVG)
		// points: Object: a polyline/polygon shape object
		if(points && points instanceof Array){
			// branch
			// points: Array: an array of points
			this.shape = dojo.gfx.makeParameters(this.shape, { points: points });
			if(closed && this.shape.points.length){ 
				this.shape.points.push(this.shape.points[0]);
			}
		}else{
			this.shape = dojo.gfx.makeParameters(this.shape, points);
		}
		this.box = null;
		var attr = [];
		var p = this.shape.points;
		for(var i = 0; i < p.length; ++i){
			attr.push(p[i].x.toFixed(8));
			attr.push(p[i].y.toFixed(8));
		}
		this.rawNode.setAttribute("points", attr.join(" "));
		return this;	// self
	}
});
dojo.gfx.Polyline.nodeType = "polyline";

dojo.declare("dojo.gfx.Image", dojo.gfx.shape.Image, {
	// summary: an image (SVG)

	setShape: function(newShape){
		// summary: sets an image shape object (SVG)
		// newShape: Object: an image shape object
		this.shape = dojo.gfx.makeParameters(this.shape, newShape);
		this.bbox = null;
		var rawNode = this.rawNode;
		for(var i in this.shape){
			if(i != "type" && i != "src"){ rawNode.setAttribute(i, this.shape[i]); }
		}
		rawNode.setAttributeNS(dojo.svg.xmlns.xlink, "href", this.shape.src);
		return this;	// self
	},
	setStroke: function(){
		// summary: ignore setting a stroke style
		return this;	// self
	},
	setFill: function(){
		// summary: ignore setting a fill style
		return this;	// self
	},
	attachStroke: function(rawNode){
		// summary: ignore attaching a stroke style
		return null;
	},
	attachFill: function(rawNode){
		// summary: ignore attaching a fill style
		return null;
	}
});
dojo.gfx.Image.nodeType = "image";

dojo.declare("dojo.gfx.Path", dojo.gfx.path.Path, {
	// summary: a path shape (SVG)

	_updateWithSegment: function(segment){
		// summary: updates the bounding box of path with new segment
		// segment: Object: a segment
		dojo.gfx.Path.superclass._updateWithSegment.apply(this, arguments);
		if(typeof(this.shape.path) == "string"){
			this.rawNode.setAttribute("d", this.shape.path);
		}
	},
	setShape: function(newShape){
		// summary: forms a path using a shape (SVG)
		// newShape: Object: an SVG path string or a path object (see dojo.gfx.defaultPath)
		dojo.gfx.Path.superclass.setShape.apply(this, arguments);
		this.rawNode.setAttribute("d", this.shape.path);
		return this;	// self
	}
});
dojo.gfx.Path.nodeType = "path";

dojo.gfx._creators = {
	// summary: SVG shape creators
	createPath: function(path){
		// summary: creates an SVG path shape
		// path: Object: a path object (see dojo.gfx.defaultPath)
		return this.createObject(dojo.gfx.Path, path);	// dojo.gfx.Path
	},
	createRect: function(rect){
		// summary: creates an SVG rectangle shape
		// rect: Object: a path object (see dojo.gfx.defaultRect)
		return this.createObject(dojo.gfx.Rect, rect);	// dojo.gfx.Rect
	},
	createCircle: function(circle){
		// summary: creates an SVG circle shape
		// circle: Object: a circle object (see dojo.gfx.defaultCircle)
		return this.createObject(dojo.gfx.Circle, circle);	// dojo.gfx.Circle
	},
	createEllipse: function(ellipse){
		// summary: creates an SVG ellipse shape
		// ellipse: Object: an ellipse object (see dojo.gfx.defaultEllipse)
		return this.createObject(dojo.gfx.Ellipse, ellipse);	// dojo.gfx.Ellipse
	},
	createLine: function(line){
		// summary: creates an SVG line shape
		// line: Object: a line object (see dojo.gfx.defaultLine)
		return this.createObject(dojo.gfx.Line, line);	// dojo.gfx.Line
	},
	createPolyline: function(points){
		// summary: creates an SVG polyline/polygon shape
		// points: Object: a points object (see dojo.gfx.defaultPolyline)
		//	or an Array of points
		return this.createObject(dojo.gfx.Polyline, points);	// dojo.gfx.Polyline
	},
	createImage: function(image){
		// summary: creates an SVG image shape
		// image: Object: an image object (see dojo.gfx.defaultImage)
		return this.createObject(dojo.gfx.Image, image);	// dojo.gfx.Image
	},
	createGroup: function(){
		// summary: creates an SVG group shape
		return this.createObject(dojo.gfx.Group);	// dojo.gfx.Group
	},
	createObject: function(shapeType, rawShape){
		// summary: creates an instance of the passed shapeType class
		// shapeType: Function: a class constructor to create an instance of
		// rawShape: Object: properties to be passed in to the classes "setShape" method
		if(!this.rawNode){ return null; }
		var shape = new shapeType();
		var node = document.createElementNS(dojo.svg.xmlns.svg, shapeType.nodeType); 
		shape.setRawNode(node);
		this.rawNode.appendChild(node);
		shape.setShape(rawShape);
		this.add(shape);
		return shape;	// dojo.gfx.Shape
	},
	// group control
	add: function(shape){
		// summary: adds a shape to a group/surface
		// shape: dojo.gfx.Shape: an SVG shape object
		var oldParent = shape.getParent();
		if(oldParent){
			oldParent.remove(shape, true);
		}
		shape._setParent(this, null);
		this.rawNode.appendChild(shape.rawNode);
		return this;	// self
	},
	remove: function(shape, silently){
		// summary: remove a shape from a group/surface
		// shape: dojo.gfx.Shape: an SVG shape object
		// silently: Boolean?: if true, regenerate a picture
		if(this.rawNode == shape.rawNode.parentNode){
			this.rawNode.removeChild(shape.rawNode);
		}
		shape._setParent(null, null);
		return this;	// self
	}
};

dojo.gfx.attachNode = function(node){
	// summary: creates a shape from a Node
	// node: Node: an SVG node
	if(!node) return null;
	var s = null;
	switch(node.tagName.toLowerCase()){
		case dojo.gfx.Rect.nodeType:
			s = new dojo.gfx.Rect();
			break;
		case dojo.gfx.Ellipse.nodeType:
			s = new dojo.gfx.Ellipse();
			break;
		case dojo.gfx.Polyline.nodeType:
			s = new dojo.gfx.Polyline();
			break;
		case dojo.gfx.Path.nodeType:
			s = new dojo.gfx.Path();
			break;
		case dojo.gfx.Circle.nodeType:
			s = new dojo.gfx.Circle();
			break;
		case dojo.gfx.Line.nodeType:
			s = new dojo.gfx.Line();
			break;
		case dojo.gfx.Image.nodeType:
			s = new dojo.gfx.Image();
			break;
		default:
			dojo.debug("FATAL ERROR! tagName = " + node.tagName);
	}
	s.attach(node);
	return s;	// dojo.gfx.Shape
};

dojo.lang.extend(dojo.gfx.Surface, {
	// summary: a surface object to be used for drawings (SVG)

	setDimensions: function(width, height){
		// summary: sets the width and height of the rawNode
		// width: String: width of surface, e.g., "100px"
		// height: String: height of surface, e.g., "100px"
		if(!this.rawNode){ return this; }
		this.rawNode.setAttribute("width",  width);
		this.rawNode.setAttribute("height", height);
		return this;	// self
	},
	getDimensions: function(){
		// summary: returns an object with properties "width" and "height"
		return this.rawNode ? {width: this.rawNode.getAttribute("width"), height: this.rawNode.getAttribute("height")} : null; // Object
	}
});

dojo.gfx.createSurface = function(parentNode, width, height){
	// summary: creates a surface (SVG)
	// parentNode: Node: a parent node
	// width: String: width of surface, e.g., "100px"
	// height: String: height of surface, e.g., "100px"

	var s = new dojo.gfx.Surface();
	s.rawNode = document.createElementNS(dojo.svg.xmlns.svg, "svg");
	s.rawNode.setAttribute("width",  width);
	s.rawNode.setAttribute("height", height);

	var defs = new dojo.gfx.svg.Defines();
	var node = document.createElementNS(dojo.svg.xmlns.svg, dojo.gfx.svg.Defines.nodeType); 
	defs.setRawNode(node);
	s.rawNode.appendChild(node);
	
	dojo.byId(parentNode).appendChild(s.rawNode);
	return s;	// dojo.gfx.Surface
};

dojo.gfx.attachSurface = function(node){
	// summary: creates a surface from a Node
	// node: Node: an SVG node
	var s = new dojo.gfx.Surface();
	s.rawNode = node;
	return s;	// dojo.gfx.Surface
};

dojo.lang.extend(dojo.gfx.Group, dojo.gfx._creators);
dojo.lang.extend(dojo.gfx.Surface, dojo.gfx._creators);

delete dojo.gfx._creators;

// Gradient and pattern

dojo.gfx.svg.Defines = function(){
	this.rawNode = null;
};
dojo.lang.extend(dojo.gfx.svg.Defines, {
	setRawNode: function(rawNode){
		this.rawNode = rawNode;
	}
});
dojo.gfx.svg.Defines.nodeType = "defs";